package com.yuke.cloud.service.omc.payUtil;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;

public class RSAEncrypt {
    private static final char[] HEX_CHAR = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
    };

    public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr) throws Exception {
        try {
            byte[] buffer = Base64.decode(publicKeyStr);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("出错了");
        } catch (InvalidKeySpecException e) {
            throw new Exception("出错了");
        } catch (NullPointerException e) {
            throw new Exception("出错了");
        }
    }


    public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception {
        if (publicKey == null) {
            throw new Exception("");
        }
        Cipher cipher = null;
        try {
            cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding");
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            byte[] output = cipher.doFinal(plainTextData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("出错了");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("出错了");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("出错了");
        } catch (BadPaddingException e) {
            throw new Exception("出错了");
        }
    }


}
